#include <cstdio>

int main() {
	int n;
	int i = 0;
	scanf("%d", &n);

	while (n != 1) {
		if (n % 2 == 0)
			n /= 2;
		else 
			n = (3 * n + 1) / 2;
		i++;
	}

	printf("%d\n", i);

	return 0;
}
